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FURNACE TUBE L. C. HAMLINK l Filed March lO, 1938 igina A25/var 6. #ANU/vx rro/P/vfrs' Patented Nov. 11, 1941 ENT OFFICE s s 5 `FURNAQE` TUBE I Lazenby C. `Hamlik, Cleveland Heights, Ohio, assignor. to rllhey Gas Machinery Company,4 Cleveland, Qhio, a corporationl of Ohio I s riginalapplication March 10,1938, Serial No.

195,075. Dividedwand this `application Marchr 16,1940, serial Nac/24,397 r I (o1. iss-ss) -larly to `annealing and other heat-treatingfurhaces. The objects of the invention areto pro- 'vide apparatusof this character which can be s s s 121"Cl`aims. The invention relates to furnaces and particueconomically made and assembledwhich is eilicient in operation,` and `the heating elements` of `,which will be extremely resistantto deterioration during operation. ,A primary object of the invention is to provide new and improved heating `3 elements for annealing and other heat-treating furnaces, and new and improved assemblies yof ysuch heating elements and the other necessary elements of such furnaces, including an improved form4 of core-buster incorporated with the heatling elements for the purpose of baiiiing the passageoftheheating gases `through the elements.

` The subjectmatter of l the instant application hasbeen divided out of my pending application `'Serial No.` 195,075, filed March 10, 19,38,` Patent No. 2,219,894.

The annexed drawing and the following description set forth in detail certain means illustrating "my improved furnace structures, such means constituting only one of the various forms inwhich the principles of the improvedfurnace `structures may be embodied.

In said annexed drawing: I Figure` lis a Vertical section of aboxtype of `integrally-formed furnace illustrating" my im- -provements, such furnace having incorporated therein as a part thereof a type `of improved refractory heating elementwhichprovides for heat treatment of the work at thej two sides of the furnace, these heating elements being providedu 'with an improved form of core-busters which act as baffles to the passageof the heating gases in order more efficiently to utilize the heat thereof; Figure 2 is a fragmentary. axial section, upon `an enlarged scale, of one of the heating elements shown in` Figure 1, the section being taken in the planes indicated by the line 22, Figures 3 and 4; s I

Figure 3 is a transverse section, taken in the planes indicated by the `line 3-l3, Figure 2; and Figure 4 is a face view, taken from the planes indicated by the line 4--4, Figure 2, of one of the core-busters mounted in the heating elements shown in Figures 1 and 2.

Referring to the annexed drawing,`I therein disclose a box type of integrally-formed furnace in which improved heating elements in the form of tubes of refractory material are incorporated `core-,blisters whereby the passage of the heating gases is baffled. I

The furnace shown in the drawing has a refractory wall I, a refractory base 2, and an arched brick roof 3 topped by insulating refractory material 4. Certain exterior strengthening structure `:of -the furnace is indicated, such as the metal T.casing 5V, and the vertical box girders B connected by the top rods Ly The furnace body structure Il() providesan interior chamber 8 within which the work maybe heat-treated. A The heating elements are comprised of a plu- `rality of aligned refractory tube sections 9 ar- `ranged interiorly adjacent `the furnace Wall I. `These heating elements are shown in the accompanying drawing as vertically arranged and are redtfrom the bottom by burners I0 and the s products of combustion are discharged through 'uppervflues-I I.

Lower openings I2 and upper openings I3 are formed in the furnace wall I,

:through which openings, respectively, the burners IlI're and the fiues II receive the products of combustion. The heating elements are supported and maintained in position by tubular bottom `elbow blocks I4` and tubular top elbow blocks I5, `which are mounted inv and project inwardly of I "the furnace wall' I, and which, respectively, comfor side heating of the work, these heating elements being provided with an improved form of municate with the wall openings I2 and the bottom lof the heating elements, and the wall openings `I3 and the top of the heating elements. The

lower-elbow blocks I4 are mounted upon ,the base 2 andhave curved passageways for the passage `ofthe heating gases from the lower wall `openings I2 to the bottom of the heating elements,

s, and the upper elbow blocks I5 are disposed adja- Acently below the` edge of the brick arch 3 and `havecurved passageways for thev passage of products `of combustion from the top Aof the heatingelements to the top wall openings I3. The upper elbow blocks I5 are formed with shouldered recesses I5 and the lower elbow blocks I4 with the shouldered recesses I4' within which the upper and lower ends, respectively, of the heating elements are seated.

To baffle the heating gases passing through the heating elements, and thus assure adequate transfer of the heat from the gases to the heat-l s ing elements, I provide core-busters within the heating elements, each core-buster being formed in a plurality of units I6, and special units 20, the upper face of each core-buster unit being formed with a seat I'I Within which a bottom conical nose portion I8` of the adjacently upper core-buster unit is seated. In the illustrative form of construction shown inthe accompanying sional core-buster units, such as those designated 2G in the drawing, are formed with supporting annular flanges 2| which conform to the crosse sectional shape and size of the wall of thegtubeV sections 9 and have tongue and groove connections with the top and bottom walls, respectively, of the adjacently lower .and upper tube sections 9. In Figure l, each third core-buster unit is shown as thus formed with such a supporting annular flange 2| to form a special core-buster unit 20. It is evident that by this construction the whole series of core-buster units is supported in the heating element and that, in addition to forming supporting members, the core-buster flanges 2l also form integral parts of the heating element wall.

What I claim is:

l. A heating element for a heat-treatment furnace consisting of a plurality of tube units, and a heat-movement-baffling member disposed in said units and having flanged portions thereof in said units and having flanged portions thereof interposed between the adjacent ends of contiguous units to support the baffling member.

3. A heating element for a heat-treatment furnace consisting of a plurality of tube units, and a heat-movement-'baling member disposed in said units and having flanged portions thereof forming integral parts of the heating element Wall.

4. A heating element for a heat-treatment furnace consisting of a plurality of tube units, and a heat-movement-baifling member comprised of a series of superimposed vunits arranged lengthwise in the tube units and having flanged portions interposed between the adjacent ends of contiguous tube units and forming bonds between adjacent tube units and serving to support the baffling member.

5. A heating element for a heat-treatment furnace consisting of a plurality of tube units, and a heat-movement-baifling member comprised of a series of superimposed units arranged lengthwise in the tube units, some of the 'baffling units having flanged portions interposed between vmovement-baiing portions extended into the conduit.

7. A heating element for a heat-treatment Y furnace consisting of a plurality of communicating tube units, and a series of superimposed apertured core-busters disposed in said units, some of said core-busters being bonded in the element wall and forming supports for the series of corebusters.

8. A heating element for a heat-treatment furnace consisting of a plurality of tube units, `and' a series of superimposed apertured corebusters disposed in said units, some of said corebusters having peripheral flanges conforming to the cross-sectional shape and size of the wall of the units and forming bonds between the adjacent ends of contiguous units.

9. A heating element for a heat-treatment furnace consisting of a plurality of communicating tube units of refractory material, and a series of connected heat-movement-bafing members of refractory material disposed in said units, some of said members being formed with flanges bond.- ed in the element wall and forming supports for the series of members.

10. A heating element for a heat-treatment furnaceconsisting of a series of tube units interspersed with icomparatively shallow bonding units between adjacent tube units, all of said units forming a continuous heat conduit, said bonding units being formed with core-busters eX- tended into the conduit.

11. A heating element for a heat-treatment furnace consisting of a series of tube units interspersed with comparatively shallow bonding units between adjacent tube units, all of said units forming a continuous heat conduit, said bonding units being formed with a series of apertured core-busters extended into the |conduit.

12. A heating element unit for a heat-treatment furnace consisting of an elongated central core portionv having spaced apertures therethrough and forming a heat-movement-bafing member, said core being integrally formed with an outwardly-extended annular continuous peripheral portion serving as a part of the heating element wall and also as a support for the unit.

LAZENBY C. HAMLINK. 

